<template>
    <transition>
        <!-- 绑定style中top和left -->
        <div class="moveBox" :style="position" v-show="show">
            <div class="moveHead" @mousedown="mousedown" @mousemove="mousemove" @mouseup="mouseup"
                @mouseleave="mousemove"></div>

            <!--关闭按钮-->
            <div class="close" @click="toggleShow">x</div>
            <div class="content">

                <!--插槽-->
                <slot></slot>

            </div>

        </div>
    </transition>
</template>
<script>
export default {
    name: "moveBox",
    data() {
        return {
            show: true,//是否显示
            x: 100,//left:x
            y: 50,//top:y
            leftOffset: 0,//鼠标距离移动窗口左侧偏移量
            topOffset: 0,//鼠标距离移动窗口顶部偏移量
            isMove: false,//是否移动标识
        };
    },
    computed: {
        //top与left加上px
        position() {
            return `top:${this.y}px;left:${this.x}px;`;
        },
    },
    methods: {
        //控制打开关闭
        toggleShow() {
            this.x = 100;
            this.y = 50;
            this.show = !this.show;
        },
        mousedown(event) {
            //鼠标按下事件
            this.leftOffset = event.offsetX;
            this.topOffset = event.offsetY;
            this.isMove = true;
        },
        //鼠标移动
        mousemove(event) {
            if (!this.isMove) {
                return;
            }
            this.x = event.clientX - this.leftOffset;
            this.y = event.clientY - this.topOffset;
        },
        //鼠标抬起
        mouseup() {
            this.isMove = false;
        },
    },
};
</script>

<style scoped>
.moveBox {
    width: 500px;
    height: 300px;
    position: fixed;
    box-shadow: 0 0 5px 3px #95a5a6;
}


    .moveHead{
        height:30px;
        background-color: #bdc3c7;
        cursor: move;
    }

    .close {
        position: absolute;
        right: 0;
        top: 0;
        line-height: 30px;
        font-size: 24px;
        cursor: pointer;
        display: block;
        width: 30px;
        height: 30px;
        text-align: center;
    }

.v-enter,
.v-leave-to {
    opacity: 0;
    transform: scale(0.5);
}

.content {
    padding: 10px;
}

.v-enter-active,
.v-leave-active {
    transition: all 0.5s ease;
}
</style>